var obj = {
    'jia':function (a,b) {
        console.log(a+b);
    },
    'jian':function(a,b){
        console.log(a - b);
    },
    'cheng':function(a,b){
        console.log(a * b);
    },
    'chu':function(a,b){
        console.log(a / b);
    }
}
module.exports= obj;

function flower(){
    console.log("送依托答辩");
}
module.exports.flower = flower;